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We've just updated all our data. If you're a Zip-It Radon™ app user, just open the app and follow the prompts.

If you prefer our data in pdf form by town name, click here for the updated list.

Radon Detection Specialists, Inc. has been testing for radon since 1986. With over 30,000 tests under our belt, we are the largest in-state radon testing firm in Illinois. We meet or exceed all state standards and perform all tests according to state protocols.

Our goal is simple: Perform a good radon test and deliver reliable results.